CVE-2026-15340CWE-120

CVE-2026-15340

Critical · published October 9, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
47.9
In the wild
Unconfirmed
What it is

lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00598 · 47.9th percentile
Weakness
CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Published
2026-10-09T19:17Z
References (2)
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-279-02.json · [email protected]https://www.cisa.gov/news-events/ics-advisories/icsa-26-279-02 · [email protected]
EPSS history
Timeline
  • 11 OCT 03:28Z
    EPSS moved — → 1%
    epss
  • 09 OCT 14:52Z
    Savannah lwIP SMTP client Classic Buffer Overflow
    cvelistv5
  • 09 OCT 14:52Z
    Savannah lwIP SMTP client Classic Buffer Overflow
    cvelistv5